A growing interest in the startup culture has focused attention on company founders who often take great risks to launch new ventures. But what about the people who join these founders to help them develop and commercialize ...

A Silicon Valley startup says it's shutting down operations and shifting to a new business model after it was blamed earlier this year for turning unwitting computer users into targets for annoying web ads—and hackers.

As more conflicts shift from land to cyberspace, the nation's defense agencies are relying less on missiles and tanks and more on Silicon Valley technology entrepreneurs and startups to secure the country's porous Internet ...